unmarked tense/aspect

Hi,
I've been making some progress on my all-verb language, and I'm trying
to work on tense and aspect.

The language will distinguish past, present and future tense
It will distinguish at least imperfective, perfective and perfect
aspect; imperfective may be divided into progressive and habitual, but
I'm not yet sure.

Are there any tense/aspect combinations that are more likely to be
unmarked than others?  I imagine it's unlikely that the future perfect
would be the unmarked form :)

Also, does anyone know about tendencies to lump certain tense/aspect
combinations together?  I understand Classical Greek distinguished
perfective and imperfective in the past but not in the present.

Thanks for any help,
-Estel

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